<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="msg" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <ShopCar
          v-for="(item, index) in goodList"
          :key="index"
          :data="item"
          :index="index"
          @del-event="goodList.splice($event, 1)"
          @change-event="goodList[$event].checked = !goodList[$event].checked"
          @jj="fn"
        ></ShopCar>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ alls }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import ShopCar from "./components/shop-car";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    ShopCar,
  },
  computed: {
    msg: {
      get() {
        return this.goodList.every((item) => item.checked === true);
      },
      set(value) {
        this.goodList.forEach((item) => {
          item.checked = value;
        });
      },
    },
    alls() {
      const news = this.goodList.filter((item) => item.checked === true);
      return news.reduce((num, item) => num + +item.num * +item.price, 0);
    },
  },
  methods: {
    fn(index, num) {
      this.goodList[index].num = num;
    },
  },
};
</script>

<style></style>
